appears outside the skin
Bone
Trochanter
The medial ankle projection is on the tibia bone. But the medial ankle projection is actually called medial malleolus.
malleus,ear bone
"A crest is a projection or ridge, especially of bone; cresta"source: chacha.com
ramus
the sharp projection of a surface is JAG
condyle
A large projection of bone found on the femur.
Bone depressions
projection. The bumps of bone around your knees and elbows are almost all called condyles.
Condyle